Exhaust muffler

Abstract

An exhaust muffler ( 1 ) for an exhaust system of an internal combustion engine, especially of a motor vehicle, includes two front-side end panels ( 2 ) facing away from each other, a circumferential jacket ( 3 ) closed in the circumferential direction, at least one exhaust muffler insert ( 4 ), with at least one inlet pipe ( 5 ) and with at least one outlet pipe ( 6 ). At least one of the pipes ( 5, 6 ) extends through the jacket ( 3 ) into the interior ( 8 ) of the exhaust muffler and is fastened to the jacket ( 3 ). Manufacture can be simplified if the pipe ( 5, 6 ) extending through the jacket ( 3 ) has a cone ( 10 ) at its inner end, if the exhaust muffler insert ( 4 ) has a countercone ( 11 ) and if the cone ( 10 ) meshes with the countercone ( 11 ).

1. An exhaust muffler for an exhaust system of an internal combustion engine, the exhaust muffler comprising:
 Two front-side end panels, which face away from each other; 
 A circumferential jacket, which is closed in a circumferential direction and cooperates with the two front-side end panels to form an interior of the exhaust muffler; 
 An exhaust muffler insert; 
 An inlet pipe; and 
 An outlet pipe, at least one of the inlet pipe and the outlet pipe being a pipe extending through the jacket into the interior of the exhaust muffler ad being fastened to the jacket and having an inner end with a cone, wherein the exhaust muffler insert has a counter cone and the cone engages with the countercone, the pipe extending through the jacket is arranged such that it is supported at the exhaust muffler insert under axial prestress via the cone engaging with the countercone. 
 
     
     
       2. An exhaust muffler in accordance with  claim 1 , wherein the axial prestress is a predetermined axial prestress selected such that a minimum axial prestress is preserved over an entire expectable thermal operating range of the exhaust muffler. 
     
     
       3. An exhaust muffler in accordance with  claim 1 , wherein:
 the cone has a conical segment-shaped or spherical segment-shaped outer contour; 
 the countercone has a conical segment-shaped or spherical segment-shaped or funnel-shaped inner contour; and 
 the countercone has a shape complementary to that of the cone. 
 
     
     
       4. An exhaust muffler in accordance with  claim 1 , further comprising:
 two intermediate panels; 
 a bracket fastened to the two intermediate panels and arranged between the end panels, wherein: 
 the cone is made integrally in one piece with the pipe extending through the jacket; 
 the countercone is formed at the bracket, which is fastened to two intermediate panels arranged between the end panels; and 
 the countercone is made integrally in one piece with the bracket. 
 
     
     
       5. An exhaust muffler in accordance with  claim 4 , wherein at least one of the following:
 the bracket is at least one of embodied and arranged such that it has spring elasticity in the area of the countercone in parallel to a longitudinal axis of the pipe extending through the jacket having the cone; and 
 the bracket is designed as a panel extending at right angles to the longitudinal axis of the pipe extending through the jacket having the cone. 
 
     
     
       6. An exhaust muffler in accordance with  claim 1 , wherein at least one of the following:
 the jacket is formed by winding a metal sheet part; and 
 the jacket has a longitudinal fold, which is located on a side facing away from the pipe passing through the jacket; and 
 at least one of the end panels forms a part of the exhaust muffler insert; and 
 the exhaust muffler insert is inserted into the jacket on the front side, and 
 the jacket is in contact with the exhaust muffler insert in a prestressed state; and 
 the other of the inlet pipe and the outlet pipe extending through one of the end panels and being fastened to the end panel. 
 
     
     
       7. An exhaust muffler in accordance with  claim 1 , wherein at least one of the following:
 the cone is supported at the countercone such that the cone is closed in a ring-shaped pattern in the circumferential direction of the pipe extending through the jacket; and 
 the cone and the countercone are located at spaced locations from the jacket; and 
 the pipe extending through the jacket is fluidically connected to the interior of the exhaust muffler to a space formed by the exhaust muffler insert in the interior of the exhaust muffler, through the cone and through the countercone. 
 
     
     
       8. An exhaust muffler in accordance with  claim 1 , wherein:
 said cone and said counter cone are in only surface contact with each other. 
 
     
     
       9. A process for manufacturing an exhaust muffler for an exhaust system of an internal combustion engine, the process comprising the steps of:
 Providing two front-side end panels, a circumferential jacket closed in a circumferential direction, an exhaust muffler insert, an inlet pipe and an outlet pipe; 
 Pushing the exhaust muffler inset into the circumferential jacket; 
 Inserting one of the inlet pipe and the outlet pipe laterally into an opening of the circumferential jacket to the extent that a cone at a preceding end of the inserted pipe engages with a counter cone formed at the exhaust muffler insert, the inserted pipe being inserted to the extent that the inserted pipe is supported at the exhaust muffler insert with an axial prestress via the cone engaging with the countercone; and 
 fastening the inserted pipe to the jacket, the inserted pipe being fastened to the jacket while the inserted pipe is supported at the exhaust muffler insert in an axially prestressed state. 
 
     
     
       10. A process in accordance with  claim 9 , wherein:
 said cone and said counter cone are only brought into surface contact with each other. 
 
     
     
       11. An exhaust muffler comprising:
 a first end panel; 
 a second end panel; 
 a circumferential jacket closed in a circumferential direction and cooperating with said first end panel and said second end panel to form an interior of the exhaust muffler, said jacket defining a jacket opening; 
 an insert disposed in said interior of the exhaust muffler, said insert defining an insert opening, said insert having an insert connection surface arranged around said insert opening, said insert connection surface having a conical shape; 
 a lateral pipe extending through said jacket opening in said jacket and into said interior of the exhaust muffler, said lateral pipe being fastened to said jacket at said jacket opening, said lateral pipe having an end defining a pipe opening, said lateral pipe having a pipe connection surface with a conical shape around said pipe opening, said pipe connection surface engaging with said insert connection surface, said pipe connection surface being in only surface contact with said insert connection surface. 
 
     
     
       12. An exhaust muffler in accordance with  claim 11 , wherein:
 said lateral pipe is arranged and fastened to said jacket to apply a biasing force from said pipe connection surface to said insert connection surface, said biasing force in combination with said conical shapes of said connection surfaces holding said insert fixed in said interior of the exhaust muffler relative to said jacket. 
 
     
     
       13. An exhaust muffler in accordance with  claim 11 , wherein:
 said conical shape of said connection surfaces have shapes blocking said insert pipe from completely passing through said insert opening in a direction radially inward of said jacket; 
 said surface contact between said connection surfaces allows radially outward movement of said lateral pipe with respect to said insert. 
 
     
     
       14. An exhaust muffler in accordance with  claim 12 , wherein the pipe extending through the jacket is arranged such that it is supported at the insert under axial prestress via the pipe connection surface engaging with the insert connection surface. 
     
     
       15. An exhaust muffler in accordance with  claim 12 , wherein:
 the pipe connection surface has a conical segment-shaped or spherical segment-shaped outer contour; 
 the insert connection surface has a conical segment-shaped or spherical segment-shaped or funnel-shaped inner contour; and 
 the insert connection surface has a shape complementary to that of the pipe connection surface. 
 
     
     
       16. An exhaust muffler in accordance with  claim 12 , wherein:
 the insert comprises two intermediate panels and a bracket fastened to the two intermediate panels and arranged between the end panels; 
 the pipe connection surface is made integrally in one piece with the pipe extending through the jacket; 
 the insert connection surface is formed at the bracket, which is fastened to the two intermediate panels arranged between the end panels; and 
 the insert connection surface is made integrally in one piece with the bracket. 
 
     
     
       17. An exhaust muffler in accordance with  claim 16 , wherein
 the bracket is at least one of embodied and arranged such that it has spring elasticity in an area of the insert connection surface in parallel to a longitudinal axis of the pipe extending through the jacket having the pipe connection surface; and 
 the bracket is designed as a panel extending at right angles to the longitudinal axis of the pipe extending through the jacket having the pipe connection surface. 
 
     
     
       18. An exhaust muffler in accordance with  claim 12 , wherein at least one of the following:
 the pipe connection surface is supported at the insert connection surface such that the pipe connection surface is closed in a ring-shaped pattern in a circumferential direction of the pipe extending through the jacket; and 
 the pipe connection surface and the insert connection surface are located at spaced locations from the jacket; and 
 the pipe extending through the jacket is fluidically connected to the interior of the to a space formed by the insert in the interior of the exhaust muffler, through the pipe connection surface and through the insert connection surface. 
 
     
     
       19. An exhaust muffler for an exhaust system of an internal combustion engine, the exhaust muffler comprising:
 Two front-side end panels, which face away from each other; 
 A circumferential jacket, which is closed in a circumferential direction and cooperates with the two front-side end panels to form an interior of the exhaust muffler; 
 An exhaust muffler insert; 
 An inlet pipe; and 
 An outlet pipe, at least one of the inlet pipe and the outlet pipe being a pipe extending through the jacket into the interior of the exhaust muffler and being fastened to the jacket and having an inner end with a cone, wherein the exhaust muffler insert has a countercone and the cone engages with the counter cone, said cone and said counter cone being only in surface contact with each other. 
 
     
     
       20. A process for manufacturing an exhaust muffler for an exhaust system of an internal combustion engine, the process comprising the steps of:
 Providing two front-side end panels, a circumferential jacket closed in a circumferential direction, an exhaust muffler insert, an inlet pipe and an outlet pipe; 
 Pushing the exhaust muffler insert into the circumferential jacket; 
 Inserting one of the inlet pipe and the outlet pipe laterally into an opening of the circumferential jacket to the extent that a cone at a preceding end of the inserted pipe engages with a counter cone formed at the exhaust muffler insert, said cone and said countercone being only brought into surface contact with each other; and 
 Fastening the inserted pipe to the jacket.